I am working with a number of very large 250m resolution raster files from the African Soil Information Service (AFSIS, http://www.isric.org/data/africa-soil-profiles-database-version-01-2) and would ...

I have a large raster file (245295396) cells and stacks of rasters having 4 layers each which lie in the extent of this large raster. To start with I am trying to get value from one stack (3 channels) ...

When I download a large map within R (using the openstreetmap package) and I reproject the map (ideally to +proj=longlat), the map will always turn out distorted, making country labels etc. near the ...

I want to run an unsupervised classification of two landsat images in qgis. Therefor I want to compute a kMeans and a SOM (self organizing maps classification). Unfortunately it doesnt work. I tried ...

I have 1600 images in Tiff format which need to be mosaiced using R.
Each 3 or 4 images need to be mosaiced together.
Using the below pattern, we can recognize which images must be mosaiced into one ...

I have multiple raster images without geoinformation. The geoinformation is stored seperately in two other rasters: one contains the Lat-coordinate of every pixel, the another the Long-coordinates. So ...

I'm a new users of spatial analyses packages in R.
I have created a SpatialPolygonsDataFrame which contains a number of rectangular polygons that i named "Square1" to "Square64".
Until now there is no ...

I'm writing a dissertation on different parameter settings in GWR . In order to perform tests I'd need the availability of geo-referenced data that show some sort of spiatial correlation (i.e. values ...

I have an empty raster shapefile that only contains the latitude and the longitude of the centroids of each grid.
I now want to add an extra variable to each grid cell coming from a cvs or txt file. ...

I want to know how to compute the importance of components for geographically-weighted-principal-component-analysis(gwpca)? That is, I want to reduce dimension according to cumulative proportion of ...

I have created 2 polygons in QGIS. Using them in R, polygons become automatically SpatialPolygonsDataFrame (SPDF). I would like to merge them into single SPDF (as is super easy in ArcGis using Tool ...

This question assumes that I'm using R with the sp and rgdal packages installed. Now that I have a set of spatial segments of class SpatialLinesDataFrame (called 'segmentData') and a set of spatial ...

I have 2 rasters, ones shows aspect and another shows date of snow thaw. I want to extract the date of snow melt based on values from the aspect raster. For example I want all the snow thaw dates from ...

I am try to find the co-ordinates of points where SpatialLines cross the edge of a SpatialPolygon. I have searched and searched, but can only find results such as over which tell me which lines cross ...

This issue is really troublesome.i have a SpatialPointsDataFrame which refers to a city.I needed to perform a join with a dbf in order to attach the population column which i did thanks to a couple of ...

Sometimes a plot looks zoomed in how to arrange that?
i use the rgeos package mainly. When i do a buffer for example somewhere the plot tends to zoom in some part of the map which is not good since it ...